Lamp-chimney



Patented Jan. [0, 1899.

F. DUNHAM.

LAMP CHIMNEY.

(Application filed Aug. 1, 1898.)

(No Model.)

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UNITED STATES FREDERICK D UNHAM,

PATENT OFFICE.

OF DEERlNG, MAINE.

-LAMP-CHIMNEY.

SPECIFICATION forming part of Letters Patent No. 617,394, dated January10, 1899.

Application filed August 1, 1898.

T0 at whom, it may concern.-

Be it known that I, FREDERICK DUNHAM, a citizen of the United States,residing at Deering, in the county of Cumberland and State of Maine,have invented certain new and use-' ful Improvements in Lamp-Chimneys;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to improvements in lamp-chimneys, and is especiallydesigned to provide a lam p-chimney which will stay firmly on the burnerand will not be easily shaken off or topple over should the lamp betaken up or moved. To accomplish this end, I provide the base'of thechimney at a point about midway between its bottom and that point fromwhich the curved part of the chimney starts with a lip or rim extendingcompletely around the circumference of the base and so arranged as tobear against the spring-arms on the burner.

I am aware that lamp-chimneys have been constructed with the end in viewof making them stay firmly on the burner, and to accomplish this somehave been provided with grooves, so as to receive the end of the holder,and also with lips or rims situated at a different place on the base. Inlamp-chimneys constructed after this fashion it requires a spe cial formof holder or aspecial burner, while the lamp-chimney as constructed byme can be fitted upon any ordinary burner.

In the drawings herewith accompanying and forming a part of thisapplication, Figure 1 is a vertical section of my improved chimney,showing the position on the burner, the burner being shown in dottedlines. Fig. 2 is an inverted plan of the chimney.

Same letters of reference refer to like parts in both figures.

In said drawings, A represents a lamp-chimney, such as is commonly usedon hand-lamps, it having a vertical portion 0 over a base. Extendingaround the base and made integral and homogeneous therewith is a rim orlip 13. I preferably make this lip or rim homogeneous with the chimneyitself. This can be done easily when the chimney is blown, but

Serial No. 687,403. (No model.)

if so desired it can be made of some light metal spun and then cementedor soldered to the glass. The base at this part never getting very warmfrom the heat of the burner, the

danger of having the chimney crack by the unequal expansion andcontraction of the two materialsis reduced to a minimum. This flange Bis situated about midway between the bottom of the base D of the chimneyand that part of the chimney which takes the flare, as shown at I, toform the conical part. It will be seen that when the chimney is insertedou the burnerE (shown in dotted lines in Fig. 1) the arms F of theburner will be slightly sprung apart as the chimney is insertedin'position. The flange will then bear against the portion G of thearms, force that portion out slightly, but at the same time not preventthe tops of the arms from fitting closely on the base, as the arms inthe ordinary lampeburners are always made slightly concaved. It isevident that aspecial form of burner or arms is not necessary forsecurely holding the chimney in place, the only requisite being that asmall space H be left between the base of the burner and the burneritself, so as to allow the lower extremity of the base to fit closelythereon.

Some chimneys have been provided with a lip at the extreme bottom-of thebase. It will be evident that such a chimney would not answer the samepurpose as my improved chimney, for the reason that it would require aholder of an entirely difierent form and the arms would not serve in anyway to hold the chimney in place. Chimneys constructed'with such a lipon the lower part of the base must tion of the flange or lip on the baseof my im proved chimney does not increase to any ap preciable extent theexpense of manufacture of the chimney and does not prevent the same frombeing used with nearly all lamp-burners.

Having thus described my invention and its use, I claim-- 1. In alamp-chimney a suitable base, an integral continuous semicircular lip onsaid base on the external circumference thereof at a point about midwaybetween the lower extremity of the base and the flaring part of thechimney,substantially as and for the purposes set forth.

2. In a lamp-chimney, a cylindrical base portion, a continuoussemicircular lip on the exterior of said base homogeneous and intograltherewith and situated at a point at or near the middle of saidcylindrical base portion, substantially as and for the purposes setforth.

In testimony whereof I affix my signature, in presence of two Witnesses,this 30th day of July, 1898.

FREDERICK DUNIIAM.

\Vitnesses:

NATHAN CLIFFORD, MARION RICHARDS.

